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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa5996de7fdsm514344466b.54.2024.12.02.06.39.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Dec 2024 06:39:06 -0800 (PST) Message-ID: Date: Mon, 2 Dec 2024 15:39:04 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: sm8550: correct MDSS interconnects To: Dmitry Baryshkov , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong Cc: Abhinav Kumar , Rob Clark , Marijn Suijten , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, freedreno@lists.freedesktop.org, stable@kernel.org References: <20241026-fix-sm8x50-mdp-icc-v2-0-fd8ddf755acc@linaro.org> <20241026-fix-sm8x50-mdp-icc-v2-1-fd8ddf755acc@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20241026-fix-sm8x50-mdp-icc-v2-1-fd8ddf755acc@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: qESD_GoJW-9zR4S7pr6Kut0yVdFlYa1_ X-Proofpoint-GUID: qESD_GoJW-9zR4S7pr6Kut0yVdFlYa1_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 phishscore=0 adultscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 mlxscore=0 mlxlogscore=756 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412020126 On 26.10.2024 7:59 PM, Dmitry Baryshkov wrote: > SM8550 lists two interconnects for the display subsystem, mdp0-mem > (between MDP and LLCC) and mdp1-mem (between LLCC and EBI, memory). > The second interconnect is a misuse. mdpN-mem paths should be used for > several outboud MDP interconnects rather than the path between LLCC and > memory. This kind of misuse can result in bandwidth underflows, possibly > degrading picture quality as the required memory bandwidth is divided > between all mdpN-mem paths (and LLCC-EBI should not be a part of such > division). > > Drop the second path and use direct MDP-EBI path for mdp0-mem until we > support separate MDP-LLCC and LLCC-EBI paths. > > Fixes: d7da51db5b81 ("arm64: dts: qcom: sm8550: add display hardware devices") > Cc: stable@kernel.org > Signed-off-by: Dmitry Baryshkov > --- Feel free to use QCOM_ICC_TAG_ALWAYS, for both patches: Reviewed-by: Konrad Dybcio Konrad